@Override
    public void warn(CharSequence content) {
        if (isWarnEnabled()) {
            logger.warn(toString(content));
        }
    }

    @Override
    public void warn(CharSequence content, Throwable error) {
        if (isWarnEnabled()) {
            logger.warn(toString(content), error);
        }
    }

    @Override
    public void warn(Throwable error) {

                    logger.info("Register {} to {}", path, indexName);
                    return true;
                }
                logger.warn("Invalid request for {}", path);
            }
        } catch (final Exception e) {
            logger.warn("Failed to register {}", filePath, e);
        }
        return false;
    }

	if l.LogLevel >= Info {
		l.Printf(l.infoStr+msg, append([]interface{}{utils.FileWithLineNum()}, data...)...)
	}
}

// Warn print warn messages
func (l *logger) Warn(ctx context.Context, msg string, data ...interface{}) {
	if l.LogLevel >= Warn {
		l.Printf(l.warnStr+msg, append([]interface{}{utils.FileWithLineNum()}, data...)...)
	}
}

// Error print error messages

            thumbnailQueueThread.join(10000);
        } catch (final InterruptedException e) {
            logger.warn("Thumbnail thread is timeouted.", e);
        }
        generatorList.forEach(g -> {
            try {
                g.destroy();
            } catch (final Exception e) {
                logger.warn("Failed to stop thumbnail generator.", e);
            }
        });
    }

	loggingOptions.WithTeeToUDS(udsSock, constants.UDSLogPath)
	assert.NoError(t, log.Configure(loggingOptions))
	log.FindScope("default").SetOutputLevel(log.DebugLevel)
	log.Debug("debug log")
	log.Info("info log")
	log.Warn("warn log")
	log.Error("error log")
	// This will error because stdout cannot sync, but the UDS part should sync
	// Ideally we would fail if the UDS part fails but the error library makes it kind of tricky
	_ = log.Sync()

                : EnumSet.of(IssueLocality.EXTERNAL);

        if (hasAnythingToReport(issuesMap, issueLocalitiesToReport)) {
            logger.warn("");
            logger.warn("Plugin {} validation issues were detected in following plugin(s)", issueLocalitiesToReport);
            logger.warn("");
            for (Map.Entry<String, PluginValidationIssues> entry : issuesMap.entrySet()) {

Log4JCategoryLog(org.apache.log4j.Category); public void trace(Object); public void trace(Object, Throwable); public void debug(Object); public void debug(Object, Throwable); public void info(Object); public void info(Object, Throwable); public void warn(Object); public void warn(Object, Throwable); public void error(Object); public void error(Object, Throwable); public void fatal(Object); public void fatal(Object, Throwable); public org.apache.log4j.Category getCategory(); public boolean isDebugEnabled(); public...

                    LOGGER.warn("{}{}", problem.getMessage(), ((loc != null && !loc.isEmpty()) ? " @ " + loc : ""));
                }

                problems = true;
            }
        }

        if (problems) {
            LOGGER.warn("");
            LOGGER.warn("It is highly recommended to fix these problems"

        if (logger.isDebugEnabled()) {
            logger.warn(msg, event.getArtifact(), event.getException().getMessage());
        } else {
            logger.warn(msg, event.getArtifact(), "enable verbose output (-X) for more details");
        }
    }

    @Override
    public void artifactDescriptorMissing(RepositoryEvent event) {

            if (!p.waitFor(commandTimeout + commandDestroyTimeout, TimeUnit.MILLISECONDS)) {
                logger.warn("Destroying {} because of the process timeout.", getName());
                p.destroy();
            }

            final int exitValue = p.exitValue();
            if (exitValue != 0) {
                logger.warn("{} is failed (exit code:{}, timeout:{}): {}", getName(), exitValue, task.isExecuted(), commandList);
            }